Composite pipe construction



Sept. 3, 1935. J. A. STADTFELD 2,013,193-

COMPOSITE PIPE CONSTRUCTION Filed Nov. 5, 1934 INVENTOR,

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A TTORNE Y Patented Sept. Y 3, 1935 STATES PATENT OFFICE COMPOSITE PIPE CONSTRUCTION Jacob A. Stadtfeld, San Francisco, Calif., assignor to Williams-Wallace Company, a corporation of California Application November 3, 1934, Serial No. 751,331 s claims. (ci. 137-15) outer metallic pipeor casing spaced lfrom the -inner core pipe, and an intermediate ller of air cell heat insulating material interposed between the inner and. outer pipes. v j Another object of my invention is to provide an improved composite pipe construction of the type characterized; the inner 'core pipe -of which is telescopically arranged with respect to the outer u -pipe and the insulating material.

A further'object of my-invention' is to provide animproved composite pipe construction of the type characterized having end fittings which provide leak proof jointsat the joined ends of a .number of sections, whereby condensates collecting on the inside surface of the inner pipes are prevented from leaking through their. joints to the outside'thereof and water running down the outside surface of the outer pipes is prevented from proceeding through their joints to the inside thereof.

Other objects more or less apparent will present themselves or will be speciilcally pointed out in the description of my invention which is to follow.

In the accompanying drawing:

Fig. 1 is a view parthr in vertical longitudinal section and partly in side Ielevation of a pair of composite pipe sections constructed in accordance with my invention;

Fig. 2 is a section taken on the line 2-2 of Fig. 1; and

Fig. 3 is a sideelevation. partly in section, of a part of one of the composite pipe sections, showing by the dotted lines the telescopic arrangement of the inner pipe with respect to the outer pipe.

Referring to the drawing it will be seen that each section of my improved composite pipe, whether it embody the particular form illustrated or some other desired shape, includes an inner core tube or pipe l, made preferably from aluminum or other suitable material which is capable of withstanding the corrosive action of acids which are sometimes carried by fluids or gases of combustion passing therethrough. Around the core tube is positioned a number of windings or layers 2 of heat insulating material which has a plurality of air cellsA 3 running longitudinally therethrough. The layers 2 are preferably made from corrugated strips of asbestos material which are aixed by an adhesive to a plain .sheet of the san material. The core tube I ts loosely within tl layers 2 and is capable of being pulled outward as indicated b9 the dotted unes in Fig. 3. Loca ed around the layers 2 and in contact therewit is an outer pipe 4 which is made from galvanizi sheet iron or other suitable material. 1 One end of the outer pipe is crimped as at so as to provide a male fitting, while its opposi end is provided with a female ttlng. The pa ticular end of the inner pipe located adjacent t] female end of the outer pipe is crimped as at so as to provide a male fitting, while its-opposi end is providedwith a female tting. B y th forming adjacent ends of the. inner and out pipes of each section with male and female tings, leak proof joints, both inside and out, a provided.. With the male end of an inner tube pointing downwardly and fitted inside the femz end of the adjoining lower section, any conden ates forming inside the saidinner pipes are ca ried over the joint in the same manner as a shi gie shedsV water. With the male endof an oui pipe of a section pointing upwardly and locat inside the female end of the next higher pipe another section, a joint is provided which she any exterior moisture running downwardly oi the outer pipes.

In assembling the sections the crimped end of the inner tube of one section is rstly pull out far enough to facilitate its easy insertion ix the female end of the inner tube of an adoini section. Thereafter the adjoining ends of i outer pipes of the sections are readily conneci in the usual manner while the joined ends of i inner pipes are maintained in connected relatic ship with each other. 'I'he telescopic arrani ment of the inner pipe with respect to the layi 2 of insulating material and the outer pipe not only facilitates the joining of the sections gether, but it permits the said inner pipe to easily cut to any desired length. The provis of air cells 3 in the layers 2 of insulating mate: provides a construction which is not only lil in weight, but one which effectively prevents passing of heat from the inner to'the outer pi The many advantages of a pipe made in acco ance with the present invention will no doubt readily understood, and although the prefer embodiments of the-invention are as illustra and described, it is to be understood that mt changes in the details of construction, and the form and shape of the sections may be nr without departing from the scope of my inv tion as defined by the appended claims.

WhatI claim is:

1. A composite pipe construction comprising an outer tube, one or more layers of insulating material located around the inside surface of the 5 said tube, and an inner tube slidably located ininto a tube and positioned inside the outer tube 1o with its outside surface in contact with the inner surface of the outer tube, and an inner tube slid;-

ably positioned inside the tube of insulating material with its outer surface in contact with the inner surface of the said tube of insulating material.

3. A composite pipe construction comprising an inner core pipe, an external pipe spaced from the inner pipe, and insti ting materiel interposed between the two pipes, the said pipes being telescopically arranged with respect to one another.

JACOB A. sTAnTFnLD.

DlsonAiMER 2,013,193.Jacob A. Stadtfeld, San Francisco, Calif. COMPOSITE PIPE CoNs'rRUc- TION. Patent dated September 3, 1935. Disclaimer tiled February 25, 1938, by the assignee, Williams-Wallace Company.

Hereby makes disclaimer of any combination of the recited elementsin claims 1 and 2, except for composite sectional,y pipes for conducting fluids or gases of combustion and except when adjacent 'e'nds of the inner and outer pipes of each section have male and female ends with the male end of the inner pipe located adjacent the female en d of the outer pipe, and with the male end of an inner tube pointing downwardly and adapted to be fitted inside the female end of the adjoining lower section so that any condensates forming inside the said inner pipes are carried over the joint, and with the male end o the outer pipe of a section pointing upwardly and adapted to be located inside the female end of the next higher pipe of another section, so that a joint is provided which sheds any exterior moisture running downwardly over theouter pipes, and the completed joints between adjacent ends of adjoining sections of the-inner and outer pipes are in substantial radial alignment, and except when each string of connected pipe, outer and inner, is independently supported and maintained in connected relationship; and except when the insulating material interposed between the two pipes provides an intermediate filler and has a plurality of air cells running longitudinally therethroug And hereby makes disclaimer of rany combination of the recited elements in claim l 3, except for composite sectiona pipes for conducting iiuids or gases of 'combustion and except 'when adjacent ends of the inner and outer pipes of each section have male and female ends with the male end of the inner pipe located adjacent the female end of the outer pipe, and with the male end of an inner tube pointing downwardly and adapted to be fitted inside the female end of the adjoining lower section so that any condensates forming inside the said inner pipes are carried over the joint, and with the male end of the outer pipe of a section pointing upwardly and adapted to be located inside the female end of the next higher pipe of another section, so that a joint is provided which sheds any exterior moisture running downwardly over the outer pipes, and the completed joints between adjacent ends of adjoining sections of the inner and outer pipes are in substantial radial alignment', and except when each string of connected pipe, outer and inner, is independently supported and maintained in connected relat1onship; and except when the insulating material interposed between the two pipes provides an intermediate filler.

[Oficial Gazette March 15, 1938.] 

